The video says MORE than four people means sangha. That is, a gathering of five or more ordained people is a sangha according to the Vinaya. I wanted to double check because Lama Phurbu Tashi asked me to edit an essay on refuge and he said five.

Imagine a man who stands before a mirror; a stone strikes it, and it falls to ruin all in an instant. And the man learns that he is himself, and not the mirrored man he had believed himself to be.-- Gene Wolfe